Reading this book is not going to make you an expert on Foucault or Lacan- however, if what you are seeking is an idea as to the spectrum of schools and branches and concerns of "critical theory," or if you're not even terribly sure what "critical theory" IS, then I suggest you pick this book up. When I was just getting started, it really helped me create a "cognitive map" of the field. Basically you get a mapped out schema of the world of critical theory, with a few tantalizing tidbits dropped about some of the thinkers- then it is up to you to go out and get the real books and start reading them. But if you are starting from nothing, and don't even know what you want to read- Donald Rumsfield's "Unknown Unknowns," then start reading this book so you can figure out what your "Known unknowns" are: "I don't know anything about Althusser, but judging on what I read in this book, I now know that I want to study him," etc. I have a few other of the "Introducing" books, and, honestly, the only one I came back to at all frequently was this one. It does not try to "explain" any particular thinker, but to introduce you to a field- I think in this regard I think it is sucessful. It is by no means perfect- for instance, Zizek only gets two teeny little pages- but, again, it is making various "names" available to you, various schools, various strands- Frankfurt school, Deconstruction, Structuralism, Post Marxist, Post Feminist, etc- so that you can go out and get started. I highly recommend this book. I think it is terrific. (Plus the illustrations are great fun!) Critical theory can be a confusing hodge podge of theoretical models- this book will help you on the path.